A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

A federal judge sentenced a former Arkansas judge Wednesday to five years in prison — a stiffer punishment than prosecutors recommended — after he admitted giving young male defendants lighter sentences in return for personal benefits that included sexual favours.

Every time I tell a mate I’m doing a story on cryptocurrency, they invariably ask me the same two questions: should they invest their own hard-earned money, and which cryptocurrency will get them a Lamborghini/yacht/island quickest?

After A Current Affair contacted Uber, Ms Quinn received a full refund.

Kirsten Swann is another Uber user who became victim to mystery charges.

In her case it was approximately $300 in Uber Eats deliveries.

"I went to bed that night, woke up the next morning to a missed call from an international number. Also, a voicemail, which I listened to and a gentleman actually was saying, 'Why did you order Indian food? You're not picking up your phone.' So straight away I thought, 'Oh, it's Uber Eats again'," Ms Swann said.

She was charged about $140 through her PayPal account.

"I don't know how my account was compromised but I'm sure this happens all the time," Ms Swann said.

Unlike Ms Quinn, Ms Swann was easily able to get her money back.

"I just had to provide a couple of proof of my identity and also the fraudulent transactions and straight away, they ruled in my favour through PayPal and also through Uber," she said.

Cyber security expert Simon Smith found several instances of Uber details being found on the dark web, an encrypted part of the world wide web that is often used for all sorts of illegal activity.

"On the dark web, I was able to find Uber accounts especially, at a premium price of four dollars," Mr Smith said.

"It's a matter of account details, because those account details unlock accounts of all the others - like Google Wallet and PayPal and credit card details. It's almost a trusted key lock that Uber have and once you've got into Uber, you've got into everything else."

"Uber has very good fraud protection. You can only use the system one trip at any one time. This protects against fraud and the fact that they weren't able to explain to customers where exactly the system has failed them, meaning that fraudulent transactions have occurred, that's of concern," she said.

In a statement to A Current Affair, Uber said it found no evidence to suggest the accounts had been compromised.

"Even if someone found a way to access another person's Uber account, they wouldn't have access to credit card details. All they can see in the app is the last four digits of the credit card," a spokesperson said.

"Uber does not store credit card numbers, which means they can't be stolen from us.

"In cases where credit cards have been used fraudulently, we work closely with financial institutions to refund charges as needed and will ban fraudulent accounts.

"We treat the security of our customers' data seriously and will act quickly when notified of fraudulent activity."